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Summary: Ctors | Methods | Inherited Methods

# PathInterpolator

`public class PathInterpolator`
`` `extends BaseInterpolator` ``

java.lang.Object
↳ | android.view.animation.BaseInterpolator
| ↳ | android.view.animation.PathInterpolator

An interpolator that can traverse a Path that extends from `Point` `(0, 0)` to `(1, 1)`. The x coordinate along the `Path` is the input value and the output is the y coordinate of the line at that point. This means that the Path must conform to a function `y = f(x)`.

The `Path` must not have gaps in the x direction and must not loop back on itself such that there can be two points sharing the same x coordinate. It is alright to have a disjoint line in the vertical direction:

>          Path path = new Path();
>          path.lineTo(0.25f, 0.25f);
>          path.moveTo(0.25f, 0.5f);
>          path.lineTo(1f, 1f);

## Summary

### Public constructors
`PathInterpolator(Path path)` Create an interpolator for an arbitrary `Path`.
`PathInterpolator(float controlX, float controlY)` Create an interpolator for a quadratic Bezier curve.
`PathInterpolator(float controlX1, float controlY1, float controlX2, float controlY2)` Create an interpolator for a cubic Bezier curve.
`PathInterpolator(Context context, AttributeSet attrs)`

### Public methods
`float` | `getInterpolation(float t)` Using the line in the Path in this interpolator that can be described as `y = f(x)`, finds the y coordinate of the line given `t` as the x coordinate.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.animation.TimeInterpolator`
`abstract float` | `getInterpolation(float input)` Maps a value representing the elapsed fraction of an animation to a value that represents the interpolated fraction.

## Public constructors

### PathInterpolator

    public PathInterpolator (Path path)

Create an interpolator for an arbitrary `Path`. The `Path` must begin at `(0, 0)` and end at `(1, 1)`.

Parameters
`path` | `Path`: The `Path` to use to make the line representing the interpolator.

### PathInterpolator

    public PathInterpolator (float controlX,
                    float controlY)

Create an interpolator for a quadratic Bezier curve. The end points `(0, 0)` and `(1, 1)` are assumed.

Parameters
`controlX` | `float`: The x coordinate of the quadratic Bezier control point.
`controlY` | `float`: The y coordinate of the quadratic Bezier control point.

### PathInterpolator

    public PathInterpolator (float controlX1,
                    float controlY1,
                    float controlX2,
                    float controlY2)

Create an interpolator for a cubic Bezier curve. The end points `(0, 0)` and `(1, 1)` are assumed.

Parameters
`controlX1` | `float`: The x coordinate of the first control point of the cubic Bezier.
`controlY1` | `float`: The y coordinate of the first control point of the cubic Bezier.
`controlX2` | `float`: The x coordinate of the second control point of the cubic Bezier.
`controlY2` | `float`: The y coordinate of the second control point of the cubic Bezier.

### PathInterpolator

    public PathInterpolator (Context context,
                    AttributeSet attrs)

Parameters
`context` | `Context`
`attrs` | `AttributeSet`

## Public methods

### getInterpolation

    public float getInterpolation (float t)

Using the line in the Path in this interpolator that can be described as `y = f(x)`, finds the y coordinate of the line given `t` as the x coordinate. Values less than 0 will always return 0 and values greater than 1 will always return 1.

Parameters
`t` | `float`: Treated as the x coordinate along the line.

Returns
`float` | The y coordinate of the Path along the line where x = `t`.

See also:

- `TimeInterpolator.getInterpolation(float)`

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